What line code below means on streaming-demo-view repo?

Hello guys!

I am reading streaming-demo-view repo and see this line code below, but I don’t understand that means
So can your guys tell me know what it means?

Could you please share the repository you are referring to?

1 Like

the repo: streaming-demo-view

The link did not get attached I am afraid.

Also is this code snippet in one of Bitquery’s products?